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/*
* Description:
* Device Driver for the Infineon Technologies
* SLD 9630 TT 1.1 and SLB 9635 TT 1.2 Trusted Platform Module
* Specifications at www.trustedcomputinggroup.org
*
* Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
* Sirrix AG - security technologies, http://www.sirrix.com and
* Applied Data Security Group, Ruhr-University Bochum, Germany
* Project-Homepage: http://www.prosec.rub.de/tpm
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*/
#include <linux/pnp.h>
#include "tpm.h"
/* Infineon specific definitions */
/* maximum number of WTX-packages */
#define TPM_MAX_WTX_PACKAGES 50
/* msleep-Time for WTX-packages */
#define TPM_WTX_MSLEEP_TIME 20
/* msleep-Time --> Interval to check status register */
#define TPM_MSLEEP_TIME 3
/* gives number of max. msleep()-calls before throwing timeout */
#define TPM_MAX_TRIES 5000
#define TPM_INFINEON_DEV_VEN_VALUE 0x15D1
/* These values will be filled after PnP-call */
static int TPM_INF_DATA;
static int TPM_INF_ADDR;
static int TPM_INF_BASE;
static int TPM_INF_PORT_LEN;
/* TPM header definitions */
enum infineon_tpm_header {
TPM_VL_VER = 0x01,
TPM_VL_CHANNEL_CONTROL = 0x07,
TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
TPM_VL_CHANNEL_TPM = 0x0B,
TPM_VL_CONTROL = 0x00,
TPM_INF_NAK = 0x15,
TPM_CTRL_WTX = 0x10,
TPM_CTRL_WTX_ABORT = 0x18,
TPM_CTRL_WTX_ABORT_ACK = 0x18,
TPM_CTRL_ERROR = 0x20,
TPM_CTRL_CHAININGACK = 0x40,
TPM_CTRL_CHAINING = 0x80,
TPM_CTRL_DATA = 0x04,
TPM_CTRL_DATA_CHA = 0x84,
TPM_CTRL_DATA_CHA_ACK = 0xC4
};
enum infineon_tpm_register {
WRFIFO = 0x00,
RDFIFO = 0x01,
STAT = 0x02,
CMD = 0x03
};
enum infineon_tpm_command_bits {
CMD_DIS = 0x00,
CMD_LP = 0x01,
CMD_RES = 0x02,
CMD_IRQC = 0x06
};
enum infineon_tpm_status_bits {
STAT_XFE = 0x00,
STAT_LPA = 0x01,
STAT_FOK = 0x02,
STAT_TOK = 0x03,
STAT_IRQA = 0x06,
STAT_RDA = 0x07
};
/* some outgoing values */
enum infineon_tpm_values {
CHIP_ID1 = 0x20,
CHIP_ID2 = 0x21,
TPM_DAR = 0x30,
RESET_LP_IRQC_DISABLE = 0x41,
ENABLE_REGISTER_PAIR = 0x55,
IOLIMH = 0x60,
IOLIML = 0x61,
DISABLE_REGISTER_PAIR = 0xAA,
IDVENL = 0xF1,
IDVENH = 0xF2,
IDPDL = 0xF3,
IDPDH = 0xF4
};
static int number_of_wtx;
static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
{
int status;
int check = 0;
int i;
if (clear_wrfifo) {
for (i = 0; i < 4096; i++) {
status = inb(chip->vendor->base + WRFIFO);
if (status == 0xff) {
if (check == 5)
break;
else
check++;
}
}
}
/* Note: The values which are currently in the FIFO of the TPM
are thrown away since there is no usage for them. Usually,
this has nothing to say, since the TPM will give its answer
immediately or will be aborted anyway, so the data here is
usually garbage and useless.
We have to clean this, because the next communication with
the TPM would be rubbish, if there is still some old data
in the Read FIFO.
*/
i = 0;
do {
status = inb(chip->vendor->base + RDFIFO);
status = inb(chip->vendor->base + STAT);
i++;
if (i == TPM_MAX_TRIES)
return -EIO;
} while ((status & (1 << STAT_RDA)) != 0);
return 0;
}
static int wait(struct tpm_chip *chip, int wait_for_bit)
{
int status;
int i;
for (i = 0; i < TPM_MAX_TRIES; i++) {
status = inb(chip->vendor->base + STAT);
/* check the status-register if wait_for_bit is set */
if (status & 1 << wait_for_bit)
break;
msleep(TPM_MSLEEP_TIME);
}
if (i == TPM_MAX_TRIES) { /* timeout occurs */
if (wait_for_bit == STAT_XFE)
dev_err(chip->dev, "Timeout in wait(STAT_XFE)\n");
if (wait_for_bit == STAT_RDA)
dev_err(chip->dev, "Timeout in wait(STAT_RDA)\n");
return -EIO;
}
return 0;
};
static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
{
wait(chip, STAT_XFE);
outb(sendbyte, chip->vendor->base + WRFIFO);
}
/* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
calculation time, it sends a WTX-package, which has to be acknowledged
or aborted. This usually occurs if you are hammering the TPM with key
creation. Set the maximum number of WTX-packages in the definitions
above, if the number is reached, the waiting-time will be denied
and the TPM command has to be resend.
*/
static void tpm_wtx(struct tpm_chip *chip)
{
number_of_wtx++;
dev_info(chip->dev, "Granting WTX (%02d / %02d)\n",
number_of_wtx, TPM_MAX_WTX_PACKAGES);
wait_and_send(chip, TPM_VL_VER);
wait_and_send(chip, TPM_CTRL_WTX);
wait_and_send(chip, 0x00);
wait_and_send(chip, 0x00);
msleep(TPM_WTX_MSLEEP_TIME);
}
static void tpm_wtx_abort(struct tpm_chip *chip)
{
dev_info(chip->dev, "Aborting WTX\n");
wait_and_send(chip, TPM_VL_VER);
wait_and_send(chip, TPM_CTRL_WTX_ABORT);
wait_and_send(chip, 0x00);
wait_and_send(chip, 0x00);
number_of_wtx = 0;
msleep(TPM_WTX_MSLEEP_TIME);
}
static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
{
int i;
int ret;
u32 size = 0;
recv_begin:
/* start receiving header */
for (i = 0; i < 4; i++) {
ret = wait(chip, STAT_RDA);
if (ret)
return -EIO;
buf[i] = inb(chip->vendor->base + RDFIFO);
}
if (buf[0] != TPM_VL_VER) {
dev_err(chip->dev,
"Wrong transport protocol implementation!\n");
return -EIO;
}
if (buf[1] == TPM_CTRL_DATA) {
/* size of the data received */
size = ((buf[2] << 8) | buf[3]);
for (i = 0; i < size; i++) {
wait(chip, STAT_RDA);
buf[i] = inb(chip->vendor->base + RDFIFO);
}
if ((size == 0x6D00) && (buf[1] == 0x80)) {
dev_err(chip->dev, "Error handling on vendor layer!\n");
return -EIO;
}
for (i = 0; i < size; i++)
buf[i] = buf[i + 6];
size = size - 6;
return size;
}
if (buf[1] == TPM_CTRL_WTX) {
dev_info(chip->dev, "WTX-package received\n");
if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
tpm_wtx(chip);
goto recv_begin;
} else {
tpm_wtx_abort(chip);
goto recv_begin;
}
}
if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
dev_info(chip->dev, "WTX-abort acknowledged\n");
return size;
}
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